Power box



FIG. 1 is a perspective view of a power box;

FIG. 2 is a front view of a power box;

FIG. 3 is a rear view of a power box;

FIG. 4 is a let-side view of a power box;

FIG. 5 is a right-side view of a power box;

FIG. 6 is a top view of a power box; and,

FIG. 7 is a bottom view of a power box.

The broken lines in the drawings depict portions of the power box that form no part of the claimed design. 

CLAIM The ornamental design for a power box, as shown and described. 